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weaken
/`wikәn/
(过去式: weakened; 过去完成式: weakened; 现在进行式: weakening)
v.t.
To reduce in quality or strength.
减弱；使薄弱。
His illness had permanently weakened him.
他的病使他永久孱弱下去。
v.i.
To become less strong.
变弱。
He weakened after his illness.
他病后体弱。
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